M54/M74HC190
M54/M74HC191
October 1992
4 BIT SYNCHRONOUS UP/DOWN COUNTERS
B1R
(Plastic Package)
ORDER CODES :
M54HCXXXF1R
M74HCXXXM1R
M74HCXXXB1R
M74HCXXXC1R
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
DESCRIPTION
.
HIGH SPEED
f
MAX
= 48 MHz (TYP.) AT V
CC
= 5 V
.
LOW POWER DISSIPATION
I
CC
= 4
A (MAX.) AT T
A
= 25
C
.
HIGH NOISE IMMUNITY
V
NIH
= V
NIL
= 28 % V
CC
(MIN.)
.
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.
SYMMETRICAL OUTPUT IMPEDANCE
I
OH
= I
OL
= 4 mA (MIN.)
.
BALANCED PROPAGATION DELAYS
t
PLH
= t
PHL
.
WIDE OPERATING VOLTAGE RANGE
V
CC
(OPR) = 2 V TO 6 V
.
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS190/191
The M54/74HC190/191 are high speed CMOS 4-BIT
SYNCHRONOUS UP/DOWN COUNTERS fabri-
cated in silicon gate C
2
MOS technology.
They have the same high speed performance of
LSTTL combined with true CMOS low power con-
sumption.
State changes of the counter are synchronous with
the LOW-to-HIGH transition of the Clock Pulse input.
An asynchronous parallel load input overrides count-
ing and loads the data present on the DATA inputs into
the flip-flops, which makes it possible to use the cir-
cuits as programmable counters. A countenable input
serves as the carry/borrow input in multi-stage
counters.
Control input,
Down/Up, determines
whether a circuit counts up or down. A MAX/MIN out-
put and a Ripple Clock output provide overflow/under-
flow indication and make possible a variety of
methods for generating carry/borrow signals in multi-
stage counter applications.
All inputs are equipped with protection circuits against
static discharge and transient excess voltage.
1/14
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
INPUTS
OUTPUS
FUNCTION
LOAD
ENABLE
D/U
CLOCK
QA
QB
QC
QD
L
X
X
X
a
b
c
d
PRESET DATA
H
L
L
UP COUNT
UP COUNT
H
L
H
DOWN COUNT
DOWN COUNT
H
H
X
NO CHANGE
NO COUNT
H
X
X
NO CHANGE
NO COUNT
X: Don't Care
a - d: The level of steady state inputs at inputs a through D respectively
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
3, 2, 6, 7
QA to QD
Flip-Flop Outputs
4
ENABLE
Count Enable Input
(Active LOW)
5
U/D
Parallel Data Input
11
LOAD
Load Input (Active LOW)
12
MA/MI OUT
Terminal Count Output
13
RC
Ripple Clock Output
(Active LOW)
14
CLOCK
Cloack Input (LOW to
HIGH, Edge-triggered)
15, 1, 10, 9
DA to DD
Data Inputs
8
GND
Ground (0V)
16
V
CC
Positive Supply Voltage
IEC LOGIC SYMBOL (HC191)
IEC LOGIC SYMBOL (HC190)
M54/M74HC190/191
2/14
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